Which of the following statements is incorrect: select one:
a. eli whitney invented the cotton gin.
b. eli whitney became very rich because of the cotton gin.
c. the north favored protective tariffs.
d. the south was opposed to protective tariffs.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

they were citizens but they could not vote and they did could not get involved into a political situation during that time.